RTV2 White Silicone Rubber for Large Craft Molds with Low Shrinkage Rate

In the production of large craft molds, the selection of condensation-type liquid silicone (condensation-type room temperature vulcanized silicone rubber, RTV-2) is based on a comprehensive consideration of its material properties, process adaptability, and cost-effectiveness. The following analysis covers material characteristics, applicable scenarios, advantages and limitations, and key points of the manufacturing process:
1. Core Characteristics of RTV2 White Silicone Rubber
1. Curing Mechanism and Material Composition
Composition: Primarily consists of base gum (hydroxyl-terminated polydimethylsiloxane), crosslinker (such as ethyl silicate), catalyst (tin compounds like stannous octoate), and filler (such as fumed silica).
Curing Method: Crosslinking is achieved through a condensation reaction, releasing small molecule byproducts like ethanol during the curing process. No heating is required; it cures at room temperature.
Typical Parameters: Mixing ratio: base gum: crosslinker: catalyst = 100:2-5:0.5-2
Pot life: 20-60 minutes (affected by temperature; higher temperatures accelerate curing).
Full curing time: 24-48 hours (at room temperature, 25°C).

For inquiries about RTV2 White Silicone Rubber, contact Ms. Chen at 13662816580